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Vishay General Semiconductor - Diodes Division SM15T27CAHM3_A/I
- Part No.:
- SM15T27CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27CAHM3_A/I.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,097
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Product details
Overview
SM15T27CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 23.1 V stand-off voltage (VWM), 25.7–28.4 V breakdown voltage (VBR), and 37.5 V clamping voltage (VC) at 40.0 A peak pulse current - used to protect automotive sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T27CAHM3_A/I datasheet, SM15T27CAHM3_A/I pinout, SM15T27CAHM3_A/I application, or SM15T27CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.39), and compatibility with high-impedance transient sources in automotive ECUs and industrial I/O modules.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical avalanche behavior in both polarities due to its bidirectional construction. It features glass-passivated junctions, low dynamic impedance (<0.9 Ω typical), and thermal resistance of 15 °C/W (junction-to-lead), enabling reliable energy absorption without thermal runaway under repetitive 10/1000 μs threats up to 1500 W.
Designed for surface-mount placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal, the SM15T27CAHM3_A/I meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and supports automotive-grade reliability via AEC-Q101 qualification - confirmed by HM3 suffix and "_A/I" tape-and-reel packaging for 13″ reels (3500 pcs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for 24 V automotive systems. |
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - verified avalanche onset range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 37.5 V at 40.0 A (10/1000 μs) - clamping level protects downstream MOSFET gates and MCU I/O pins from overvoltage stress. |
| PPPM | 1500 W - peak pulse power rating enables suppression of lightning surges (IEC 61000-4-5 Level 4) and motor-switching transients. |
| TJ max. | +150 °C - junction temperature limit supports operation in engine bay and powertrain control units. |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
| Qualification | AEC-Q101 qualified, halogen-free, RoHS-compliant - required for automotive electronics supply chain traceability and environmental compliance. |
Pinout & Package
SM15T27CAHM3_A/I uses a 2-terminal SMC (DO-214AB) package with no polarity marking (bidirectional). Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, mounted on 8.0 mm × 8.0 mm copper pads per lead for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Accepts surge current during positive voltage excursions; symmetrically identical to cathode in bidirectional operation. |
| Cathode | Transient current entry point (negative half-cycle) | Accepts surge current during negative voltage excursions; electrically interchangeable with anode for CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN FD, LIN, sensor bridges) without polarity concerns. |
| 1500 W peak pulse power | Meets IEC 61000-4-5 4th-level surge immunity requirements when paired with appropriate source impedance. |
| AEC-Q101 qualification | Validated for automotive applications including powertrain, body control, and ADAS sensor interfaces with zero early-life failure risk. |
| Low clamping ratio (VC/VBR = 1.39) | Minimizes protected circuit overvoltage margin, allowing tighter design margins for 3.3 V or 5 V logic interfaces. |
| Halogen-free & RoHS | Complies with EU Directive 2011/65/EU and automotive OEM material declarations (e.g., GMW3059, Ford WSS-M99P9999-A1). |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control modules exposed to load-dump and alternator ripple. IC Role / Device Role / Timing Role: Voltage-clamping TVS element placed directly at connector interface to shunt transients before reaching ADC input or signal conditioner IC. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs by limiting transient voltage to ≤37.5 V during 40 A surges. | Use Scenario: Shielding RS-485 transceiver data lines in factory automation PLCs from ESD and inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Bidirectional transient suppressor installed across differential pair (A/B) to clamp common-mode surges without distorting signal integrity. Use Value: Maintains >25 kV HBM ESD immunity and survives repeated 1 kV/500 A surge events per IEC 61000-4-4, extending field lifetime. |
| Automotive Body Electronics | Telecom Power Interface |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs in door modules and lighting control units subjected to battery reverse-connection and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail, coordinated with upstream fuse and downstream LDO to form layered protection. Use Value: Clamps 12 V rail to <40 V during 100 V/10 ms load-dump events, preventing burnout of 40 V-rated power FETs and regulators. | Use Scenario: Protecting PoE-powered Ethernet switches and base station power inputs from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC input side after primary gas discharge tube (GDT), absorbing residual energy and limiting let-through voltage. Use Value: Reduces residual clamping voltage to 37.5 V at 40 A, enabling use of lower-voltage-rated DC-DC controllers and reducing system BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | Lower PPPM (400 W), higher VC (38.9 V at 10.3 A), SMA package (smaller thermal mass) | Not AEC-Q101 qualified; suitable only for commercial-grade consumer or telecom equipment | Select when cost sensitivity outweighs automotive reliability requirements and surge threat level is ≤Level 2 (IEC 61000-4-5). |
| 1.5KE27CA | Higher VC (45.0 V at 33.3 A), axial DO-201 package (manual assembly), non-halogen-free option available | Lacks MSL-1 reflow rating and automotive qualification; limited to through-hole industrial designs | Choose for legacy board upgrades where SMC footprint change is prohibited and AEC-Q101 is not mandated. |
Compared with SMAJ24CA and 1.5KE27CA, the SM15T27CAHM3_A/I delivers 3.75× higher peak power handling, AEC-Q101 assurance for automotive deployment, and halogen-free compliance - making it the preferred choice for new designs targeting ISO 16750-2 and IEC 61000-4-5 Level 4 immunity.
Availability
SM15T27CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O line hardening, and telecom power interface applications requiring stable component supply, long-term lifecycle support, and full traceability for Tier-1 OEM programs.
Supply support for SM15T27CAHM3_A/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SM15T Series is designed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against lightning, ESD, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SM15T27CAHM3_A/I at its rated peak pulse current?
The SM15T27CAHM3_A/I has a maximum clamping voltage (VC) of 37.5 V at 40.0 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuits during worst-case surge events - critical for ensuring compatibility with 3.3 V, 5 V, and 24 V system components.
Is SM15T27CAHM3_A/I qualified for automotive applications?
Yes, SM15T27CAHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101) and "_A/I" packaging code (13″ tape-and-reel). It is approved for use in automotive powertrain, chassis, and body electronics where sustained operation from −40 °C to +125 °C ambient and immunity to mechanical shock/vibration are required.
What does the "CA" suffix indicate in SM15T27CAHM3_A/I?
The "CA" suffix in SM15T27CAHM3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, CA devices have no polarity marking and are used where signal lines may experience AC-coupled or floating transients, such as in CAN, LIN, or sensor bridge outputs.
What is the thermal resistance of SM15T27CAHM3_A/I from junction to lead?
The SM15T27CAHM3_A/I has a typical thermal resistance (RθJL) of 15 °C/W from junction to lead, as specified in the Thermal Characteristics table of Vishay document 88380. This low value enables efficient heat transfer to the PCB copper pads, supporting reliable operation under repetitive surge conditions when mounted per recommended 8.0 mm × 8.0 mm pad layout.
How does SM15T27CAHM3_A/I differ from SM15T27AHM3_A/I?
The SM15T27CAHM3_A/I is bidirectional (CA), while SM15T27AHM3_A/I is unidirectional (A). Their VWM, VBR, and VC values differ accordingly: the CA version has symmetric characteristics (23.1 V VWM, 25.7–28.4 V VBR, 37.5 V VC), whereas the A version specifies cathode-anode polarity and higher reverse leakage tolerance. Functionally, CA is mandatory for AC or floating signal protection; A is used for DC-biased rails.
SM15T27CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SM15T27CAHM3_A/I FAQ
1.How can I place an order for SM15T27CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27CAHM3_A/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM15T27CAHM3_A/I reliable?
The price and inventory of SM15T27CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T27CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27CAHM3_A/I?
SM15T27CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27CAHM3_A/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM15T27CAHM3_A/I?
For technical support, including SM15T27CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27CAHM3_A/I requirements.
6.How does Aetrix verify that SM15T27CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T27CAHM3_A/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM15T27CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T27CAHM3_A/I?
All SM15T27CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27CAHM3_A/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM15T27CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM15T27CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T27CAHM3_A/I Tags
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